Finnish Sauna Builders™ Custom Indoor Sauna Room Kit

Transform your home into a private wellness retreat with the Finnish Sauna Builders™ Custom Indoor Sauna Room Kit. Designed for homeowners, DIY enthusiasts, designers, and professional contractors, this complete custom home sauna kit makes it easier to create an authentic Finnish sauna experience tailored to your space.

Each sauna kit is custom prepared to your room dimensions and includes the interior components needed to build a beautiful, functional sauna. Choose from premium wood options to create the look, feel, and atmosphere that best complements your home.

Complete Custom Sauna Kit — Ready for Your Space

Our custom indoor sauna kit arrives with all interior components precisely cut and tailored to your room dimensions. You provide the framing, insulation, electrical wiring, and exterior wall covering—we supply the rest.

By providing the sauna interior components in a custom-cut package, Finnish Sauna Builders™ simplifies the process of creating a high-quality indoor Finnish sauna, whether you're completing a DIY project or working with a professional contractor.

Building your dream home sauna has never been easier.

Premium Sauna Wood Options — Choose Your Perfect Finish

Your sauna interior should be as beautiful as it is functional. Choose from three exceptional wood options, each offering its own distinctive appearance and performance characteristics.

Grade A Knot-Free Western Red Cedar

A timeless favorite among sauna enthusiasts, Grade A Knot-Free Western Red Cedar brings classic beauty and natural performance to your sauna interior.

This premium softwood remains comfortably cool to the touch during sauna sessions while naturally resisting moisture and decay. Its refined, knot-free appearance creates an elegant, uninterrupted look, with beautiful color variations ranging from reddish and pinkish-brown tones to darker bands and subtle pale sapwood streaks.

Western Red Cedar is an excellent choice for homeowners seeking the traditional warmth, character, and unmistakable appearance associated with a classic Finnish sauna.

Thermo Aspen/Alder

For a contemporary, sophisticated sauna aesthetic, choose Thermo Aspen/Alder—a premium thermally modified wood designed for enhanced performance and visual appeal.

Heat-treated at 419°F or higher, this advanced thermal modification process creates a deep, rich color while significantly enhancing the wood's durability and dimensional stability.

The result is a refined sauna interior with a modern appearance and exceptional performance characteristics. Thermo Aspen/Alder is suitable for both indoor and outdoor applications, making it a versatile choice for distinctive sauna and wellness projects.

Choose the Sauna Interior That Fits Your Vision

Whether you prefer the timeless character of knot-free Western Red Cedar or the rich, contemporary appearance of Thermo Aspen/Alder, Finnish Sauna Builders™ gives you the flexibility to create a sauna interior tailored to your personal style.

Why Choose a Finnish Sauna Builders™ Custom Sauna Kit?

• Custom indoor sauna kit tailored to your room dimensions

• Designed for an authentic Finnish sauna experience

• Ideal for homeowners, DIY enthusiasts, and professional contractors

• Precisely cut interior components for a streamlined installation

• Premium Grade A Knot-Free Western Red Cedar option

• Premium Thermo Aspen/Alder option

• Beautiful wood finishes for traditional and contemporary sauna designs

• A convenient solution for creating a custom home sauna

Create Your Authentic Finnish Sauna at Home

Turn your space into a private destination for relaxation, heat, and wellness with the Finnish Sauna Builders™ Custom Indoor Sauna Room Kit.

From the timeless beauty of Western Red Cedar to the rich, modern character of Thermo Aspen/Alder, every detail gives you the freedom to create a sauna that feels uniquely yours.

Build your custom Finnish sauna. Bring the wellness experience home.

Thermo Poplar

A thermally modified wood treated at approximately 374°F for optimal indoor sauna use. This medium modification delivers enhanced dimensional stability, improved resistance to humidity and temperature fluctuations, and a warm, rich tone—all achieved through a chemical-free process. Ideal for creating a naturally beautiful, long-lasting sauna environment.

Customizable Bench Configurations

Choose the bench layout that best fits your space and needs from our selection of configurations shown in the product images. Each configuration is designed to maximize comfort and optimize your sauna experience.

What's Included in Your Custom Sauna Kit:

• Foil vapor barrier for proper moisture protection
• Ergonomic backrests for comfortable relaxation
• 1×4 tongue & groove boards (walls & ceiling) in your selected wood
• Clear 1×4 bench boards with supports (20″ deep) in matching wood—custom-built to your chosen configuration
• Corner moldings for walls, ceiling, and baseboards (matching wood)
• All-glass sauna door with wood handles and trim
  • Frame: 27.2″ × 78.7″ (690 × 2000 mm)
  • Glass: 24.4″ × 77.3″ (620 × 1963 mm)
  • Frame thickness: 1.65″ × 3.6″ (42 × 92 mm)
  • Rough opening required: 28″ × 80″
• Duckboard flooring for walk area (matching wood)
• Upper and lower vent grills for proper air circulation
• Traditional sauna bucket with liner and ladle
• Sauna thermometer for temperature monitoring
• Comfortable headrest
• Marine-grade, wall-mount, vapor-proof sauna light
• Detailed installation instructions for easy assembly

Important Installation Notes:

• Recommended ceiling height is 8 feet per manufacturer safety and clearance guidelines. For custom ceiling heights, please contact our support team.

Perfect for Home or Commercial Use

Whether you're building a personal wellness sanctuary or outfitting a spa or gym, our DIY sauna kits deliver professional-quality materials at competitive prices.

Expert Support Available

Contact your Finnish Sauna Builders Specialist today for personalized guidance in creating the perfect sauna room for you and your family.